drivers/acpi/acpica/uteval.c

   1 /******************************************************************************
   2  *
   3  * Module Name: uteval - Object evaluation
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "acnamesp.h"
  47
  48 #define _COMPONENT          ACPI_UTILITIES
  49 ACPI_MODULE_NAME("uteval")
  50
  51 /*******************************************************************************
  52  *
  53  * FUNCTION:    acpi_ut_evaluate_object
  54  *
  55  * PARAMETERS:  prefix_node         - Starting node
  56  *              path                - Path to object from starting node
  57  *              expected_return_types - Bitmap of allowed return types
  58  *              return_desc         - Where a return value is stored
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Evaluates a namespace object and verifies the type of the
  63  *              return object. Common code that simplifies accessing objects
  64  *              that have required return objects of fixed types.
  65  *
  66  *              NOTE: Internal function, no parameter validation
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status
  71 acpi_ut_evaluate_object(struct acpi_namespace_node *prefix_node,
  72                         char *path,
  73                         u32 expected_return_btypes,
  74                         union acpi_operand_object **return_desc)
  75 {
  76         struct acpi_evaluate_info *info;
  77         acpi_status status;
  78         u32 return_btype;
  79
  80         ACPI_FUNCTION_TRACE(ut_evaluate_object);
  81
  82         /* Allocate the evaluation information block */
  83
  84         info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_evaluate_info));
  85         if (!info) {
  86                 return_ACPI_STATUS(AE_NO_MEMORY);
  87         }
  88
  89         info->prefix_node = prefix_node;
  90         info->relative_pathname = path;
  91
  92         /* Evaluate the object/method */
  93
  94         status = acpi_ns_evaluate(info);
  95         if (ACPI_FAILURE(status)) {
  96                 if (status == AE_NOT_FOUND) {
  97                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
  98                                           "[%4.4s.%s] was not found\n",
  99                                           acpi_ut_get_node_name(prefix_node),
 100                                           path));
 101                 } else {
 102                         ACPI_ERROR_METHOD("Method execution failed",
 103                                           prefix_node, path, status);
 104                 }
 105
 106                 goto cleanup;
 107         }
 108
 109         /* Did we get a return object? */
 110
 111         if (!info->return_object) {
 112                 if (expected_return_btypes) {
 113                         ACPI_ERROR_METHOD("No object was returned from",
 114                                           prefix_node, path, AE_NOT_EXIST);
 115
 116                         status = AE_NOT_EXIST;
 117                 }
 118
 119                 goto cleanup;
 120         }
 121
 122         /* Map the return object type to the bitmapped type */
 123
 124         switch ((info->return_object)->common.type) {
 125         case ACPI_TYPE_INTEGER:
 126
 127                 return_btype = ACPI_BTYPE_INTEGER;
 128                 break;
 129
 130         case ACPI_TYPE_BUFFER:
 131
 132                 return_btype = ACPI_BTYPE_BUFFER;
 133                 break;
 134
 135         case ACPI_TYPE_STRING:
 136
 137                 return_btype = ACPI_BTYPE_STRING;
 138                 break;
 139
 140         case ACPI_TYPE_PACKAGE:
 141
 142                 return_btype = ACPI_BTYPE_PACKAGE;
 143                 break;
 144
 145         default:
 146
 147                 return_btype = 0;
 148                 break;
 149         }
 150
 151         if ((acpi_gbl_enable_interpreter_slack) && (!expected_return_btypes)) {
 152                 /*
 153                  * We received a return object, but one was not expected. This can
 154                  * happen frequently if the "implicit return" feature is enabled.
 155                  * Just delete the return object and return AE_OK.
 156                  */
 157                 acpi_ut_remove_reference(info->return_object);
 158                 goto cleanup;
 159         }
 160
 161         /* Is the return object one of the expected types? */
 162
 163         if (!(expected_return_btypes & return_btype)) {
 164                 ACPI_ERROR_METHOD("Return object type is incorrect",
 165                                   prefix_node, path, AE_TYPE);
 166
 167                 ACPI_ERROR((AE_INFO,
 168                             "Type returned from %s was incorrect: %s, expected Btypes: 0x%X",
 169                             path,
 170                             acpi_ut_get_object_type_name(info->return_object),
 171                             expected_return_btypes));
 172
 173                 /* On error exit, we must delete the return object */
 174
 175                 acpi_ut_remove_reference(info->return_object);
 176                 status = AE_TYPE;
 177                 goto cleanup;
 178         }
 179
 180         /* Object type is OK, return it */
 181
 182         *return_desc = info->return_object;
 183
 184 cleanup:
 185         ACPI_FREE(info);
 186         return_ACPI_STATUS(status);
 187 }
 188
 189 /*******************************************************************************
 190  *
 191  * FUNCTION:    acpi_ut_evaluate_numeric_object
 192  *
 193  * PARAMETERS:  object_name         - Object name to be evaluated
 194  *              device_node         - Node for the device
 195  *              value               - Where the value is returned
 196  *
 197  * RETURN:      Status
 198  *
 199  * DESCRIPTION: Evaluates a numeric namespace object for a selected device
 200  *              and stores result in *Value.
 201  *
 202  *              NOTE: Internal function, no parameter validation
 203  *
 204  ******************************************************************************/
 205
 206 acpi_status
 207 acpi_ut_evaluate_numeric_object(char *object_name,
 208                                 struct acpi_namespace_node *device_node,
 209                                 u64 *value)
 210 {
 211         union acpi_operand_object *obj_desc;
 212         acpi_status status;
 213
 214         ACPI_FUNCTION_TRACE(ut_evaluate_numeric_object);
 215
 216         status = acpi_ut_evaluate_object(device_node, object_name,
 217                                          ACPI_BTYPE_INTEGER, &obj_desc);
 218         if (ACPI_FAILURE(status)) {
 219                 return_ACPI_STATUS(status);
 220         }
 221
 222         /* Get the returned Integer */
 223
 224         *value = obj_desc->integer.value;
 225
 226         /* On exit, we must delete the return object */
 227
 228         acpi_ut_remove_reference(obj_desc);
 229         return_ACPI_STATUS(status);
 230 }
 231
 232 /*******************************************************************************
 233  *
 234  * FUNCTION:    acpi_ut_execute_STA
 235  *
 236  * PARAMETERS:  device_node         - Node for the device
 237  *              flags               - Where the status flags are returned
 238  *
 239  * RETURN:      Status
 240  *
 241  * DESCRIPTION: Executes _STA for selected device and stores results in
 242  *              *Flags. If _STA does not exist, then the device is assumed
 243  *              to be present/functional/enabled (as per the ACPI spec).
 244  *
 245  *              NOTE: Internal function, no parameter validation
 246  *
 247  ******************************************************************************/
 248
 249 acpi_status
 250 acpi_ut_execute_STA(struct acpi_namespace_node *device_node, u32 * flags)
 251 {
 252         union acpi_operand_object *obj_desc;
 253         acpi_status status;
 254
 255         ACPI_FUNCTION_TRACE(ut_execute_STA);
 256
 257         status = acpi_ut_evaluate_object(device_node, METHOD_NAME__STA,
 258                                          ACPI_BTYPE_INTEGER, &obj_desc);
 259         if (ACPI_FAILURE(status)) {
 260                 if (AE_NOT_FOUND == status) {
 261                         /*
 262                          * if _STA does not exist, then (as per the ACPI specification),
 263                          * the returned flags will indicate that the device is present,
 264                          * functional, and enabled.
 265                          */
 266                         ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 267                                           "_STA on %4.4s was not found, assuming device is present\n",
 268                                           acpi_ut_get_node_name(device_node)));
 269
 270                         *flags = ACPI_UINT32_MAX;
 271                         status = AE_OK;
 272                 }
 273
 274                 return_ACPI_STATUS(status);
 275         }
 276
 277         /* Extract the status flags */
 278
 279         *flags = (u32) obj_desc->integer.value;
 280
 281         /* On exit, we must delete the return object */
 282
 283         acpi_ut_remove_reference(obj_desc);
 284         return_ACPI_STATUS(status);
 285 }
 286
 287 /*******************************************************************************
 288  *
 289  * FUNCTION:    acpi_ut_execute_power_methods
 290  *
 291  * PARAMETERS:  device_node         - Node for the device
 292  *              method_names        - Array of power method names
 293  *              method_count        - Number of methods to execute
 294  *              out_values          - Where the power method values are returned
 295  *
 296  * RETURN:      Status, out_values
 297  *
 298  * DESCRIPTION: Executes the specified power methods for the device and returns
 299  *              the result(s).
 300  *
 301  *              NOTE: Internal function, no parameter validation
 302  *
 303 ******************************************************************************/
 304
 305 acpi_status
 306 acpi_ut_execute_power_methods(struct acpi_namespace_node *device_node,
 307                               const char **method_names,
 308                               u8 method_count, u8 *out_values)
 309 {
 310         union acpi_operand_object *obj_desc;
 311         acpi_status status;
 312         acpi_status final_status = AE_NOT_FOUND;
 313         u32 i;
 314
 315         ACPI_FUNCTION_TRACE(ut_execute_power_methods);
 316
 317         for (i = 0; i < method_count; i++) {
 318                 /*
 319                  * Execute the power method (_sx_d or _sx_w). The only allowable
 320                  * return type is an Integer.
 321                  */
 322                 status = acpi_ut_evaluate_object(device_node,
 323                                                  ACPI_CAST_PTR(char,
 324                                                                method_names[i]),
 325                                                  ACPI_BTYPE_INTEGER, &obj_desc);
 326                 if (ACPI_SUCCESS(status)) {
 327                         out_values[i] = (u8)obj_desc->integer.value;
 328
 329                         /* Delete the return object */
 330
 331                         acpi_ut_remove_reference(obj_desc);
 332                         final_status = AE_OK;   /* At least one value is valid */
 333                         continue;
 334                 }
 335
 336                 out_values[i] = ACPI_UINT8_MAX;
 337                 if (status == AE_NOT_FOUND) {
 338                         continue;       /* Ignore if not found */
 339                 }
 340
 341                 ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
 342                                   "Failed %s on Device %4.4s, %s\n",
 343                                   ACPI_CAST_PTR(char, method_names[i]),
 344                                   acpi_ut_get_node_name(device_node),
 345                                   acpi_format_exception(status)));
 346         }
 347
 348         return_ACPI_STATUS(final_status);
 349 }